/contract Readme and Makefile

Readme.md

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+# Dexorder contract
+
+Dexorder Solidity code is in this subproject. This readme is for running contract code standalone for testing purposes.
+
+## Quickstart
+
+```bash
+# install dependencies: foundry, jq, make
+curl -L https://foundry.paradigm.xyz | bash
+sudo apt  install jq
+sudo apt install make
+
+# build and test the contract
+make
+```
+
+## Development
+
+The development environment is based on [Foundry](https://book.getfoundry.sh) toolset.